Please analyze Twitter and respond (short and clear answer, no need to write official paper):
1. Why is Twitter struggling?
2. What role do industry and firm effects?
3. WHat grade would you give Dick Costolo? (Twitter's CEO 2010-2015)
4. Why is crafting a good strategy at Twitter so difficult?
Please, take in consideration business strategy, factors that affect performance, industry conditions, opportunities, experience, how was the business strategy designed (consistency, environment, etc.)